What should be used to prevent fine scratches on the nails?

Using a fine buffer is essential for preventing fine scratches on the nails due to its smooth surface, which efficiently polishes the nail without causing damage. A fine buffer is specifically designed to provide a gentle finish, creating a shiny and sleek appearance while minimizing any risk of scratching the nail plate.

In contrast, medium grit abrasives and coarse grit buffers are too abrasive for this purpose. They are intended for more significant filing, shaping, or removing product and could leave noticeable scratches on the surface of the nails. A hard file, similarly, is designed for shaping and can be too rough, leading to similar issues. Therefore, a fine buffer is the right choice for achieving a polished, scratch-free finish.